I am reading the book tilted "quantum field theory in a nutshell(second version)" by A.Zee. On the page 45, for example there is a term [tex]\frac{1}{m^2}λJ^4[/tex]. The question is that how to related it to the Figure 1.7.1. or that, How can I draw the three diagrams in Figure 1.7.1 from the term [tex]\frac{1}{m^2}λJ^4[/tex]? Many thanks!!(adsbygoogle = window.adsbygoogle || []).push({});

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# How to draw Feynman diagrams

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